I have had a Brenthaven Backpack for my MBP since new.. very well made, great storage (maybe too much as I end up "collecting" stuff easily...) for extra Battery/ Portable HD/ Camera, etc... Super quality Zippers and Very Well Lined Protective Area for computer...

Overall could not be happier with it!! Two of my friends have purchased the same since as well...

Not cheap ($150.00 area) but then, neither was my Computer!!! Can be found cheaper on ebay, often <$100.00.. Definitely worth looking at if you want a Backpack style bag.

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